/*
 * Copyright (C) 2007-2010 Geometer Plus <contact@geometerplus.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.zlibrary.core.image;

import org.geometerplus.zlibrary.core.filesystem.ZLFile;

import java.io.IOException;
import java.io.InputStream;

public class ZLFileImage extends ZLSingleImage {
    private final ZLFile myFile;
    private final int myOffset;
    private final int myLength;

    public ZLFileImage(String mimeType, ZLFile file, int offset, int length) {
        super(mimeType);
        myFile = file;
        myOffset = offset;
        myLength = length;
    }

    public ZLFileImage(String mimeType, ZLFile file) {
        this(mimeType, file, 0, (int) file.size());
    }

    public byte[] byteData() {
        try {
            final InputStream stream = myFile.getInputStream();
            int toSkip = myOffset - (int) stream.skip(myOffset);
            while (--toSkip >= 0) {
                stream.read();
            }

            byte[] buffer = new byte[myLength];
            stream.read(buffer);
            stream.close();
            return buffer;
        } catch (IOException e) {
        }

        return new byte[0];
    }
}
